FIG. 2.

(A) Sulfate reduction in Desulfovibrio desulfuricans cultures over a 120-h period. The SRR was calculated from the results of a linear regression analysis of the amount of sulfate reduced over time. Inorganic Hg (100 ng ml⁻¹) was added at 12 h. (B) MMR in pure cultures of Desulfovibrio desulfuricans. Inorganic Hg (100 ng ml⁻¹) was added at zero time. A linear regression analysis was performed with CH₃Hg concentrations obtained between 24 and 96 h.